Thrown when FlowSegment.FlowType is NOT TR55FlowSegmentType.FlowTypeChannel or TR55FlowSegmentType.FlowTypeShallowConc
Thrown when FlowSegment.IsTravelTimeCalculated is false.
Remarks
This property is valid in TR-55 calculation when FlowSegment.FlowType is TR55FlowSegmentType.FlowTypeChannel or TR55FlowSegmentType.FlowTypeShallowConc.
The unit of value is defined by the drawing unit in drawing settings (CivilDocument.Settings.DrawingSettings.UnitZoneSettings.DrawingUnits).
Drawing Unit is feet: foot/sec.; Drawing unit is meter: meter/sec.